I'm mostly focused on web development with React and Next.js, but I can guide you through the process of setting up multiple Flutter SDK versions for your project. Here's a step-by-step guide to help you manage different Flutter versions:

1. Download Multiple Flutter SDKs:

   • Go to the Flutter SDK archive: https://flutter.dev/docs/development/tools/sdk/releases
   • Download the Flutter SDK version you need (e.g., the latest version and the older version required for your project)
   • Extract each SDK to a separate directory (e.g., flutter_latest and flutter_old)

2. Set up environment variables:

   • Open your system's environment variables settings
   • Create a new environment variable called FLUTTER_LATEST and set its value to the path of your latest Flutter SDK
   • Create another environment variable called FLUTTER_OLD and set its value to the path of your older Flutter SDK

3. Update your PATH:

   • Edit your system's PATH environment variable
   • Add %FLUTTER_LATEST%\bin and %FLUTTER_OLD%\bin to your PATH

4. Create batch files for easy switching:

   • Create a file named use_flutter_latest.bat with the following content:

     @echo off set PATH=%FLUTTER_LATEST%\bin;%PATH% echo Switched to latest Flutter version flutter --version

   • Create another file named use_flutter_old.bat with the following content:

     @echo off set PATH=%FLUTTER_OLD%\bin;%PATH% echo Switched to old Flutter version flutter --version

5. Project-specific Flutter version:

   • In your project's root directory, create a file named .fvm/fvm_config.json

   • Add the following content, replacing <version> with your desired Flutter version:

     { "flutterSdkVersion": "<version>" }

6. Using different Flutter versions:

   • To use the latest version globally, run use_flutter_latest.bat
   • To use the old version globally, run use_flutter_old.bat

   • For project-specific version:

     • Install FVM (Flutter Version Management) by running:

       dart pub global activate fvm

     • In your project directory, run:

       fvm use <version>
     • Use fvm flutter instead of flutter for commands in your project

7. Updating your IDE:

   • In Android Studio or VS Code, update the Flutter SDK path to point to the version you want to use for each project

   • For VS Code, you can create a .vscode/settings.json file in your project with:

     { "dart.flutterSdkPath": ".fvm/flutter_sdk" }

8. Managing dependencies:

   • In your pubspec.yaml, specify version constraints for packages that are compatible with your chosen Flutter version

By following these steps, you should be able to manage multiple Flutter SDK versions and switch between them as needed for different projects or packages. Remember to test your app thoroughly after switching versions to ensure compatibility.

Here's the updated batch file for switching to the old Flutter version:

This batch file will:

1. Clear the console output
2. Set the PATH environment variable to include the old Flutter SDK path
3. Display a message confirming the switch
4. Show the current Flutter version

You can save this as use_flutter_old.bat and run it whenever you need to switch to the older Flutter version. Make sure to create a similar file for your latest Flutter version if you haven't already.